Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201702476
Keywords
graphene; iron carbides; nanoparticles; oxygen reduction reaction
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Funding
- Natural Science Foundation of China [21671173, 61674166]
- Zhejiang Provincial Natural Science Foundation of China [LR14B010001]
- Zhejiang Provincial Public Welfare Project [2016C31015]
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Synthesis of highly efficient nonprecious metal electrocatalysts for the oxygen reduction reaction (ORR) superior to platinum (Pt) is still a big challenge. Herein, a new highly active ORR electrocatalyst is reported based on graphene layers-wrapped Fe/Fe5C2 nanoparticles supported on N-doped graphene nanosheets (GL-Fe/Fe5C2/NG) through simply annealing a mixture of bulk graphitic carbon nitride (g-C3N4) and ferrocene. An interesting exfoliation-denitrogen mechanism underlying the conversion of bulk g-C3N4 into N-doped graphene nanosheets is revealed. Owing to the high graphitic degree, optimum N-doping level and sufficient active sites from the graphene layers-wrapped Fe/Fe5C2 nanoparticles, the as-prepared GL-Fe/Fe5C2/NG electrocatalyst obtained at 800 degrees C exhibits outstanding ORR activity with a 20 mV more positive half-wave potential than the commercial Pt/C catalyst in 0.1 m KOH solution and a comparable onset potential of 0.98 V. This makes GL-Fe/Fe5C2/NG an outstanding electrocatalyst for ORR in alkaline solution.
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